Lap truing machine



June 1952 w. A. GUNNING ET AL 2,599,759

LAP TRUING MACHINE Filed Sept. 29, 1948 I 6 Sheets-Sheet l 0 WW I o 0 4 z! I 28 l I no 2'Z0 INVENTOR. W\L.L.|AM A GUNNING GEORGE c- FAVRE.

ATTORNEY June 1952 w. A. GUNNING ET AL 2,599,759

LAP TRUING MACHINE Filed Sept. 29, 1948 6 Sheets-Sheet 2 INVENTOR. WILLIAM A. GUNNING GEORGE. C FAVIZE E i/m% ATTQ IZNEY June 10, 1952 w. A. GUNNING ET AL 2,599,759

LAP TRUING MACHINE Filed Sept. 29, 1948 6 Sheets-Sheet 5 INVENTOR. W|LLIAM A. GUNNHQG H9 GEORGE C,- FAVRE BY H n7 /vu W ATTORNEY June 10, 1952 w. A. GUNNING ET AL 2,599,759

LAP TRUING MACHINE Filed Sept. 29, 1948 '6 Sheets-Sheet 4 llllllllulllll INVENTOR.

wmuma A. GUNNING BY I fim%ram Ai-Torcrqev GEORGE Ci FAVRE June 1952 w. A. GUNNING ET AL 2,599,759

LAP TRUING MACHINE Filed Sept. 29, 1948 6 Sheets-Sheet 5 I! I 8| -17 u 89 I O 65 7 1| lllllllllllllllk Figd'S INVENTOR.

Wl\..\ \AM A. GUNNING GEORGE. C- FAVRE ATTORNEY June 10, 1952 w. A. GUNNING ET AL 2,599,759

LAP TRUING MACHINE Filed Sept. 29, 1948 6 Sheets-Sheet 6 INVENTOR. WILLIAM A. GUNN\NG GEORGE c. FAVRE.

ATTO I2 N EV Patented June 10, 1952 UNITED STATES PATENT OFFICE LAP TRUING MACHINE William A. Gunning and George C. Favre, Southbridge, Mass., assignors to American Optical Company, Southbridge, Mass, a voluntary association of Massachusetts Application September 29, 1948, Serial No. 51,706

14 Claims. 1

This invention relates to curve generating machines and has particular reference to machines commonly known in the art as lap truing machines used for producing the curved surfaces on tools of the type employed in forming ophthalmic lenses.

One of the principal objects of this invention is to provide a curve generating machine adapted to produce surface curves ranging from 2 to 20 diopters on such articles as laps used in the ophthalmic art.

Another object is the provision of a machine of the above character having improved means for simply and efficiently setting up the machine for automatic and accurate production of the entire range of surface shapes either of single or compound'curvatures.

' Another object is the provision of an improved machine of the above character employing a graduated scale bar with Vernier type slides arranged thereon to facilitate setting up operations and provide a greater degree of accuracy of the curves produced by the machine.

Another object is to provide a machine of the above character having improved control means therefor so constructed and arranged that after beingset up to produce a desired surface curvature on a lap or similar article, the machine will employ a rocking motion under control of an electrical power system to automatic-ally generate a curve on the lap in accordance with the machines settings, and at the conclusion of the cutting operation the machine will be automatically stopped until properly reset by the operator.

Another object is to provide a lap truing machine of the above nature of an extremely simple and compact nature having the operative parts thereof so constructed and arranged that the machine will occupy a minimum of space to accurately produce any surface curvature in the entire range on articles such as laps, the machine, due to the particular construction and arrangement of parts, being further characterized by ruggedness of a heretofore unapproached nature further leading to increased accuracy and efficiency of operation.

Further objects are to provide in a manner as hereinafter set forth a curve generating machine which is comparatively simple in its construction, durable, thoroughly efficient in its use and capable of being readily set up and adjusted for shaping the surfaces of articles such as laps having various surface characteristics.

Other objects and advantages of the invention will become apparent from the following descrip- 2 tion taken in connection with the accompanying drawings, in which:

Fig. l is a perspective view of a machine embodying the present invention; 7

Fig. 2 is a fragmentary sectional view through the machine showing the operative parts therein;

Fig. 3 is a fragmentary side View illustrating the means for initially adjusting the device for rendering the machine inoperative;

Fig. 4 is a fragmentary sectional view of the operative parts controlled by the adjustment shown in Fig. 3;

Fig. 5 is a fragmentary sid elevation ofthe power driving means for oscillating the machine yoke;

Fig. 6 is a perspective view of the gauge means used for setting up the machine to produce desired curvatures;

Fig. 7 is a fragmentary top'plan view of the reversible yoke and its associated parts;

Fig. 8 is'a fragmentary view illustrating the means for reversing the machine yoke;

Fig. 9 is a fragmentary top plan view illustrating the use of the gauge mean for setting the cutting tool in the yoke for oscillation on a specified radius;

Fig. 10 is a fragmentary top plan view illustrating the means for setting the cutting tool When mounted in the machine tailstock;

Figs. 11, 12 and 13 are fragmentary side elevations illustrating various adjustments of the machine to produce various types of surface curvatures Fig. 14 is a sectional top plan view of the cam operated switch controlling device;

Fig. 15 shows the clapper box carrying the cutting tocl and removed from the device; and v Fig. 16 is a fragmentary sectional view showing the clapper box with the cutting tool in engagement with the surface of a lap to be generated.

Machines of this character are commonly known in the ophthalmic art as lap truing machines which are capable of generating different surface curvature on laps used in forming curved surfaces on lens blanks. Lap truing machines of this nature in the past have been limvited as to the numberof different surface curvatures which they were capable of producing with the limitations being primarily in weak or shallow curve generations, such curves having relatively long radii. A reason for such limitation is that machines of this nature are commonly used by len dispensers who, in most instances, carry on their businesses in limited areas in ofiice buildings, thus requiring such machines to be restricted as to size. 'Most prior art machines of thisnature, because of the above restrictions, could not produce all of the shapes desired, particularly shallow curved shapes and therefore such laps were in most instances obtained from optical, manufatit lrers who have the facilities for producing them. .AlthoughpmoSt the prior art lap truing machines did not produce the full range of curvatures of' laps required.

prior'art through the provision of simple and improved means for quickly and efficiently adjusting the machine to produce the particular surface cu ature s e Referring more particularly to the drawings wherein like characters of reference designate like parts. throughout the several views, the lap truing machine embodying the invention comprises a base [5 having a pair of spaced uprights iii and H in which is rotatably supported end portions l8 and IQ of a substantially U-shaped yolge 2B. base has provided in its upper su ace apa r spaced long tudinally ex end ing machined slideways 2] in which is slidablymounted a slide member 22 (Fig. 2) havin firmy ed to i s u der sid as by the bolts 23 a tubular'member 24,. The tubular member 24 has an enlarged portion 25 formed on one side wtherecrf' which is provided with a longitudinal opening 26 through which is extended the slide member drive shaft 21, a threaded portion of the drive shaft 21 being in mesh with threads formed in a boss (not shown) on the slide member 22 so that when the shaft 2'! is manually or otherwise rotated, asbythe handle 28, which i located onthe end of the shaft 21 which protrudes from the forward end of the base l5,'the slide member 22 will be made to slide in the slideways 2| longitudinally of the machine and in a forward or reverse direction in accordance with the direction of rotation of the shaft 2L The slide member 22 may, if desired, be provided with a chip removing plate 29 to clear the ways 2! of foreign matter and so facilitate the operation of the device and protect the machined surfaces.

The slide member 22 is provided with an undercut portion adjacent'one of the slideways 2| in which resides a'machined gib 30, the gib 30 being adapted to fit snugly between the member 22 and the slideway 2 l. The portion of the slide member 22 overlapping the gib has a vertical bore axially aligned with a threaded opening in the gib 30, the concentric bore and opening being adapted to receive a threaded clamp 3| in such a manner that when the slide member 22 is set in a. desired position in the slideways 2! the clamp 3| may be turned so that the gib 30 will be drawn upwardly and become wedged between the side of the slideway 2| and the side of the undercut portion of the slide member 22, thus locking the slide member immovably in place.

The bore in the tubular member 24 is vertically aligned with a similar bore in the slide member 22, both bores being adapted to receive an immovable bushing 52 which in turn is adapted to rotatably receive the downwardly extending pivot member 33 of a supportin plate 34 which rotatably resides upon the slide member 22.

supp rtin p a e v3i is adap e t rotate on the surface of the slide member 22 and about the axis of the pivot member 33 by means of a worm gear 35 (Fig. 2) which is fixedly located on one end of a rotatable drive shaft the worm gear 35 being in mesh with the toothed portion It! of a ring member 38 which is secured to the lower .QQIH' QIJIT Q E 0f the base portion of the supporting platefid, as by threaded studs 33. The drive shaft 35 extends forwardly of the machine and is supported near its outer end in a suitable bearing 4.0. The end of the shaft 35 is provided with a handle #4! so that it may be manually rotated to turn thesupporting plate 3 about the axis of the pivot member 33,

The supporting plate 34 is provided with a pair of spaced guideways 42 in which is slidably carried a tailstock 43. The base portion 44 of the tailstock 43 has suitably attached to the lower surface thereof a lug 45 which is adapted to extend downwardly into a longitudinal slotted opening 46 within the Supporting plate 34, and which threaded opening 41 adapted to receive a threadd p rt n f a forwardly extending shaft 48. the shaft 48 being shaped at its forward end to reoeive a remo able handle so that the shaft is can be'manually rotated to cause the tailstock to slide lon itudinally on thesurface oi the supporting plate 34. A gib 49 is positioned againstthe ide wall ofone 0f the guideways (6.2 between the supporting plate 3.4 and the adjacent portion 59 i the 'tailstocl; base p on 44 and in position to be engaged by the render a stud .5! .inserted through the Portion 50. By tightening the stud 5| the end thereof can be made to wedge the gib 49 against the wall of the guideway to lock the tailstock against sliding movement on the supporting plate 34.

The upper end of the tailstock, 43 has a bearing 52 (Fig. 1) provided therein, the bearing being adapted to support a holder 53 carrying a lap 54 or similar article to be surfaced.

The yoke 20 which is rotatably carried in the upper ends of the spaced uprights l6 and i1 is provided with a bearing 55 in which is slidably mounted a sleeve 56 (Fig. 7), the sleeve being adapted to carry at its forward end a clapper box 51 which in turn supports a suitable cutting tool 53. The sleeve 56 is adjustably located in the bearing 55 in the desired position and can be locked in this position by a handle 59 which is threadedly attached to a threaded stud 60, the stud extending through a pair of spaced bosses 6| formed on the bearing 55. By turning the handle 59 on the stud 60 the bosses 61 will be forced toward each other and thus cause the bearing to fit tightly about the sleeve 56, holding it immovable until the handle is released.

When the yoke is caused to oscillate in the bearings l8 and IS the tool 58 will consequently be moved in vertical strokes, such motion being imparted through a power driven disc 62 (Fig. 5) having a connecting rod 633 eccentrically and adjustably pivoted thereto. The connecting rod 63 is connected by motion transfer lever means 64 to the yoke 20, and upon rotation of the disc 62 the connecting rod 63 will operate the motion is provided with a longitudinal transfer lever means 84 and cause theyoke and tool 58 to be oscillated in the uprights I8 and IT.

The clapper box 51 carrying the cutting tool 58 is constructed in such a manner that the cutting tool is held rigid as it travels across the face of the lap to produce a cut on the lap when the yoke 20 is caused to oscillate in one direction, and to yield on the return stroke when the yoke is caused to oscillate in the reverse direction. The clapper box 51 is formed with a head portion I33 and an elongated shank portion I34, the shank portion I34 being located within the sleeve 56 carried in the yoke 29 to an extent permitted by a flange I35 formed therearound (Figs. 15 and 16), and is aligned in the sleeve and prevented from rotation therein by a pin I36 which is fixedly located in the sleeve 56 and adapted to reside within opposed slots I 31 formed in the Walls of the shank portion I34 of the clapper box 51. The head portion I33 is provided with a transverse bore I 38 in which is rotatably located a cylinder I39, and is also provided with a slot I40 communicating with the bore I38 and disposed in the portion of the surface away from the shank portion I34. The cylinder I39 is provided with a horizontal opening shaped for the insertion of the cutting tool 58, a set screw I4I being provided to retain the tool 58 in located position within the cylinder I39, the tool being adapted to extend through the slot I40 as shown by full lines in Fig. 16 and having its cutting point disposed on the center line of the clapper box. A notch I42 is formed in the rear portion of the cylinder I39 and a headed stop pin I43 is located in the clapper box head portion in such a position that it will be normally engaged by the vertical wall of the notch I42. This position of the cylinder I39 with respect to the stop pin I43 is maintained during the cutting stroke of the device wherein the force exerted upon the tool 58 as it traverses the face of the lap 54 tends to cause the cylinder I39 to rotate, such rotation being prevented by the stop pin I43. Upon the return stroke, however, as the tool 58 contacts the lap 54 the force exerted will cause the cylinder I39 to rotate about its axis I44 to an extent permitted by the inclined upper surface of the notch I42. This is suflicient to cause the tool to lightly contact the face of the lap and the position of the parts during the return stroke are substantially as shown in dotted outline in Fig. 16. This rotation is against the tension of a coil spring I45 which is located in a longitudinal bore I45 in the shank portion I34 of the clapper box, the spring engaging one end of a sliding pin arrangement I41, which pin has its other end in engagement with a notch I48 formed in the rear portion of the cylinder I39 at a point below the axis point I44 of the cylinder. A stud I49 is threadedly inserted in the bore I46 to retain the spring I45 in position and to enable the tension of the spring to be varied. Thus, the tool 58 will be held rigid during the cutting stroke and will yield upon the return stroke.

Prior to causing the cutting tool 58 to be oscillated, the tool and lap 54 are initialy adjusted to provide the proper setup for obtaining the curve generation desired. These adjustments are made through the use of a scale bar or gauge 65 (Fig. 6) which is provided on the front surface with millimeter graduations 66. Adjustable longitudinally on the bar 65 are slides 61 and '68, these slides being of the vernier type and each having conventional vernier graduations 69.

In setting up the machine to provide the lap 54 with a spherical concave surface, wherein the curves in both the horizontal and the vertical meridians are coincident, it is necessary to loosen the clamp for the sleeve 56 by moving the handle 59 in a direction to permit the adjustable sleeve 56 to be moved in the bearing 55 of the yoke 20. Then after setting the slide 68 at the proper reading on the scale bar 65 to indicate the desired radius of curve to be provided in a vertical meridian and locking the slide immovable on the bar by means of the set screw ID, the stem or extension II formed integral with one end of the bar 65 is inserted in an opening 12 provided therefor in the yoke 20 (Fig. 9). When inserting the bar 65 in the opening 12 it is important that the bar 35 be inserted so that the pointer I3 on the slide 68 extends in a direction so that it may be engaged by the cutting tool 58 when the sleeve 56 is moved forwardly in the yoke 29. After moving the sleeve 56 so that the end of the tool 56 abuts against the slide pointer I3, the handle 59 may again be operatedto lock the sleeve 56 immovable in the yoke bearing 55 as described. This adjusetment will result in the tool being so adjusted that it will oscillate on an arc coincident with the radius of the curve desired in a vertical meridian. It is important to note that although the base of the yoke 29 and the bearing 55 are substantially rearwardly disposed from the axis line of the yoke pivotal end portions I8 and I9, the graduations on the scale bar being located so as to position the end of the tool with respect to the horizontal axis line I5 of the yoke pivotal end portions I8 and I9 when the scale bar is positioned as illustrated in Fig. 9. Thus the cutting edge of the tool 58 will oscillate on a radius about the axis line I5 and will produce a curve in accordance with the reading on the scale bar 65 as indicated by the slide 68.

To provide the curve in the horizontal meridian it is necessary to align the vertical axis I4 about which the tailstock 43 rotates so that the radius of such rotation is coincident with the radius of oscillation of the cutting tool 58. This is accomplished by manual rotation of the handle 28 which will cause the slide member 22 and parts mounted thereon to move longitudinally on the base I5. The base I5 is provided on one side thereof at a point adjacent an upper edge with a graduated indicator plate I6 (Fig. 11). The slide member 22 carries a corresponding indicator plate I! so located that when the slide member 22 is moved longitudinally of the base I5 the indicator plates I6 and 'I'! will be in vertical alignment when the vertical axis 14 of the supporting plate 34 carried by the slide member 22 is in alignment with the axis of the yoke 29 and tool 58. Thus since the cutting tool 58 oscillates about a radius coincident with the radius about which the lap 54 rotates, it is apparent that the surface of the lap 54, when brought intoengagement with the cutting tool 58 by manual rotation of the shaft 48, will have similar curves generated thereon in vertical and horizontal meridians, thus forming the desired spherical concave surface.

After the machine has been set to provide the desired surface curvatures as described suitable control mechanism may be operated to cause the machine to function. Such control mechanism may be any conventional type which will function to cause rotation of the disc 52 and consequent operation of the connection rod 63 attached thereto. This causes, through the motion transfer lever means 64, the oscillation of the cut- '7 ineooth about theaxisl 1.5.. The-extentoi this oscillating movement is sufiicient to cause the cutting tool. 511 to traverse the entirewidthloi the face of the lap.- 54? which is to be surfaced. Simultaneous to this: function a power driven. adjustable stroke pawl 18 engages a ratchet wheel 19 attachedito. the drive shaft 35 of the mechanism for rotating: the supporting plate 34. near the outerend'thereofand' advances the ratchet wheel an amount equal to the tooth displacement of the pawl. A suitable spring pressed plunger. 85 having a portion adapted for engagement with the teeth-of the ratchet wheel 19 is adapted; to hold: the ratchet wheel in advanced position. This causes the ratchet'wheel 19 to rotate and to, in turn, rotate the worm gear 35. The worm gear, 35 which is-in meshedrelation with-the tooth portion 51 of the ring member 38' secured to the supporting plate 34 will cause the tailstock 33 to beswungin, anarc about the pivotal member 33 (Fig 2). This operation causes the lap 54 to move in a direction substantialy normal to the path of movement of the oscillating cutting tool 58 carried by the yoke 26. This is merely general description of a conventional lap truing machine. During such rotary movement of the supporting plate 34-the base M of the tailstock 43 is lockedin fixed relation with the supporting plate as by means of the adjustable studs 5!.

When centering the machine, that is, posi- .tioning the vertical axis 74 of the supporting plate 34 for'the' tailstock 43 to intersect the axis line l5 of the yoke 26; it is possible to maintain the slide member 22 in fixed relation to the base 15 of the machine without the necessity of re1ying on the: locking clamp 13!. This is accomplished by providing abore 6| extending into the base l5, the bore 8'! having the indicator plate base I5 as by a chain 83 (Fig. 1), in the bore 81 7 when the indicator plates 16 and 1'! are aligned the slide 22 can be rendered immovable on the base until the plug 82 is removed.

The above describes the forming of a spherical concave surface on the lap 54.

It is to be understood that prior, to causing the cutting tool to reciprocate transversely of the face of the lap 54 and to simultaneously cause said lap to move in a path substantially normal to the path of movement of the cutting tool, the lap and cutting tool are initially adjusted relative to each other. The lap tailstcck 33 is initially adjusted in a sidewise direction an amount suflicient to clear the cutting tool 55 prior to starting the cutting operation whereby the cutting tool will transverse the entire surface area of the lap.

In producing a spherical convex surface on the lap 54 the setup is opposite to that used for producing a spherical concave surface. The lap 54 andcutting tool 58 are interchanged, with the tool 58 and clapper box 57 being inserted in the tailstock 43 and the lap'residing in the sleeve 56 in the yoke 25. Thus, in the operation of the machine the lap will oscillate vertically in accordance with the action of the yoke 26 while 8 thezcuttingi tool will rotaterwith. thetailstockto produce the convex surfaceeonlthe lap.

To set the machine to produce the desired spherical: convex surface curvature. of the, slide 22 is adjusted longitudinally of the slidewa r; 2:! by'manual rotation of thehandle 28 to a position wherein the" indicator plate T1. is aligned with the indicator plate. 16 and with the bore 8! whereby the locating plug 82 may be positioned in said bore to retain. the notched portions of they indicator plates l6 and H in fixed alignment with each other. againstv one side of thesupporting plate 34 and is held in said position by inserting its stem H extending; rearwardly and inwardly of an open ing in a boss 89 formed integral with the, side of thesupporting. plate 345, see Fig. 11. The slide (it may then be moved longitudinally of the scale bar to the position thereon in accordance with the radius of curvature desired as established bythe proper. graduations E6 on thescale, or this setting may be formed prior. to securing the-scale in position on the supporting plate 34. An b shaped gauge 84, as shown in Fig. 10;, having a hand gripknob 85 on the sidethereof and having a pin-like protuberance 88 adjacent one end thereof is positioned on the tailstock 43' with its longitudinal side portion 35 lying within a longitudinal groove 81 formed in the side of the tailstock 43 and with its pin-like protuberance SS fitting within an opening in said tailstock. The tool 58 is then adjusted longitudinally in the tailstock until its cutting edge is in abutting re= lation. with'the base portion of the gauge. This establishes the distance between the end of the tool 58' and the tailstock A3 and simultaneously locates the end of the tool at a. given fixed. posi tion with respect to the indicator line on the plate 59, which position. is established accordin to the graduations 66- on the scale 65 so that when the position of said. graduations E fi is fixed by placing the stem ll in the boss 89 the given designated graduations on the scale will, during the adjustment of the member 68- longitudinally thereof into alignment with given graduations on the scale; automatically position the tool at the proper distance from the center lineit when the indicator line on the plate 99 is thereafter moved into alignment with the notch ill. This latter adjustment is obtained through the use of a detachable handle (not shown) which is secured to the shaft 68 and by means of which the said shaft can be rotated to move the tailstock 43 longitudinally of the supporting plate 34 to a position wherein the'said indicator line on the plate 96 is in alignment with the notch Si.

It is to be understood that a different sequence of adjustments may be employed in order to obtain the above setting and it is not of necessity, for example, that the slide 22 be first adjusted to the proper position as established by the indi=- cator plates 16 and 71, which position automatically locates the'axis M- in intersecting relation with the axis 15 of the yoke 25 as this adjustment could be performed after the tool position was established through the use of the L-shaped gauge, etc.

After the above adjustments have been accomplished and in order to generate the curve on the lap the handle 59 is adjusted to a position wherein the sleeve 56 carrying the lap 54 may be moved longitudinally in the yoke 25. This movement is such as to bring the lap into cutting relation with the tool 58. The handle 59 is then manipulated to secure the sleeve in the yoke and to retain the The scale bar 65 is then positioned awaits) lapin fixed position of adjustment. Subsequent to this positioning of the lap in desired relation with the tool the machine is set into operation as hereinbefore described to produce the desired spherical convex surface on the lap.

In producing a sphero-cylinder concave surface on the lap 54 the lap will be positioned in the tailstock 43 with the tool located for oscillation with the yoke 20. In this setup the tool is adjusted by using the scale bar 65 as hereinbefore described to control the radius about which it will oscillate. After adjusting the tool, the scale bar 65 is removed from the yoke 20 and .is then brought into a position as indicated in Fig. 12 wherein, with the slide 61 set at the proper graduation 66 to indicate the radius of base curve desired, the scale bar 65 will rest upon a shelf 92 formed on the machine base I adjacent and parallel to one of the guideways 2| thereof. The shell? 92 is provided with an upwardly extending pin 93 which, in this particular adjusting operation, resides in a comating opening formed in the bottom of the slide 68. The stem portion ll of the scale bar 65, in this instance, is positioned to extend in a direction forwardly of the machine. The handle 28 may be operated to cause the slide member 22 to be moved on the base IE to a position wherein the indicator line on a plate 94 will become aligned with a notch 95 provided in the slide 61. This will establish a radius about which the tailstock 43 will rotate to produce a curve in one of the major meridians of the lap known or designated as the base curve and which has a radius different from the radius of the curve in the other major meridian of the lap known or designated as the cylinder curve, which latter radius is established by setting the end of the cutting tool at the desired distance from the center line of the bearings l8 and I9.

In producing a sphero-cylinder convex surface on the lap, the lap and cutting tool are interchanged as in producing a spherical convex surface. The scale bar 65 is then brought into position upon the shelf 92 with the pin 93 being inserted in the opening in the bottom of the slide 68 and with the stem portion H of the scale bar now extending in a direction rearwardly of the machine. Then by operating handle 28, the slide member 22 can be moved on the base I5 until the indicator line on the plate 94 is in alignment with the notch 9| in the scale slide 68 (Fig. 13). After this latter adjustment has been accomplishment the scale bar 65 is then positioned against the side of the supporting plate 34 with its stem portion ll extending within the bore of the boss 89 as illustrated in Fig. 11. The tailstock can then be adjusted so that the indicator line on the plate 90 and notch 9| on scale 68 is aligned as hereinbefore described. Then the lap can be moved in the yoke 20 into proper relation with the cutting tool so that the desired sphero-cylinder convex surface is obtained.

The foregoing procedure is used when producing all surface curvatures from 3 diopters to 20 diopters. However, when it is desired to produce curves below 3 diopters it is necessary to alter the machine somewhat to accommodate the extra length radii necessary to produce the curves. This alteration is made so that the machine and parts carried thereby will occupy a minimum of floor space and is accomplished by first removing the sleeve 56 from the yoke 20 and rotating the yoke 180 in its bearings l8 and I9 to the position shown in dotted outline in Fig. 7. In order to make this change the yoke 20 is disconnected 10 from the motion transfer lever meansj 64. The means 64 includesan operating arm 96' (Fig. 8) which is operatively mounted on a shaft 91 rotatably supported in the upper endof the upright I1. The operating arm 96 is provided with a bifurcated extension or arm 98 and a diametrically opposed bifurcated arm 99. In the construction of the machine for operation as hereinbefore described, the shaft 91 carrying the yoke 29 is provided' with a bifurcated member I00 fixedly secured adjacent the arm 98 to and rotatable with said shaft 91. To operatively connect the motion transfer means 64 to the yoke 28 so that the yoke will oscillate in its bearings in response to the action of the connection rod 63, the member I00 is connected to the arm 98 by means ofaneyebolt and nut. connection 10!. However, to. alter the machine to accommodatecurves .Of lon er radii the connection 10] isdisengaged fromthe arm 98 and the yoke member. I together with the yoke 20 is rotated .to the;,position;indicated in dotted outline in Fig.j 8,.wherein the member. I00 will be, located adjacent the arntij99 and connected thereto by the connection 19!; as, it was previously connected tothe armg98. ;By-so, changing themachine the yoke 20 will be posi tioned as indicated in dotted outline in Fig.7. and will be operated inuthe manner hereinbefore-described. .The sleeve. 58 maythen be reinserted in the yoke. bearing 55 and, due to "the new; position oflthe yoke,may be projected towardthe forward endof the machinean amount greaterthan was possible with they yokewpositioned, in the previous manner. p

To produce a spherical concave surface. of less than 3 diopters on therlap 54 .the scale bar 65 is used to position the cutting tool .58 with re-. spect to the. radiusflof curve desired. ,However, since the yoke is in a different position thanformerly the slide 68 is aligned with a series of milli: meter graduationson the reverse side of the bar from the graduations 66,.this seriesof gradua-.

tions being figured so that theradiuswill be; es tablished from, the axis line 15 so that the proper curve will be generated. The machine will: then be centered as p eviously described; This will permit a spherical concave surface to be formed.

on the lap.

To generate a spherical convex and spheroebodying the present invention the cycle of move.l-.-

ment of the lap andrtool, relatve to; each other during the cutting of the surface, as, for example, the cycle of movement of parts simulating the supporting plate 34 of the present invention which carries the tailstock .43 about its pivot member 33, is generally constant regardless of the radius of curvature of the surface being gen erated on the lap. This cycle, in such prior art machines, was established by the required amount of movement of the lap andgtoolrelative to each other during the producingv of a surface curvature of the shortestv possible radius. A surfaceof a long radius of curvature requires much less encountered due to the waste motion'of the lap' and tool relative to each other throughout that tailstock 43 about the axis of its pivot 33 is controllable so that its cycle of movement will be only that required'to produce the surface shape on the-particular lap being surfaced. This is acc'omplishedby providing means for adjusting the lap and tool to required initial position at the star-tcf the cut and by automatically stopping the movement of the lap and tool relative to each other at thecompletion of the cut.

This meanscomprises a control arm I02 located adjacent one side of the supporting plate 34 (Figs. '2, 3, land the control arm I02 being fixedly secured to one end of a shaft I03 rotatably mounted through the side walls'of the plate 34 andcarrying a lever arm I04 thereon. The control arm I02 is positioned longitudinally of the supporting plate 34 in such a manner that it will be engaged by an adjustable member I05 which is adjustably located on the base 44 of the tailstock 43 immediately above the control arm I02.

The control arm I02 is normally inclined and has its outer end disposed higher than its supported end. -I-Iowever, when the tailstock 43 is moved on the supporting plate 34 the member I05 will ride longitudinally along the upper edge .of the adapted to reside within avertical slot I09 in the.

narrowed lower end of the bore I01, see Fig. 2. Thus,'the cam shaft I00 may slide vertically in the. -member 33 and. will rotate with the member 33' as the member is caused to rotate by movement of the supporting plate 34. A coil spring H0 resides within the bore I01 and around the shaft I06, a collar III secured as by a pin H2 to the upper end of the shaft serves to retain'the spring I I0 in this position, the lower end of the spring abutting upon the shelf formed in the bore I01 .adjacent this lower end. Thus, when the lever arm. I04 forces the cam shaft I06 downwardly, the movement is against the force exerted by the coil spring H0. 'The rearward movement ofthe tailstock 43 and consequent downward movement of the control arm I02, lever arm I04,

I113 iand I.-I:9, the branch II8 extending beneath 12 the cam member H3 and having an adjustable follower I2l located at the end thereof in engagement with the irregular surface I I3d of the cam member H3. The other branch II9 has a stud I2! located thereon which is adapted to retain one end of a coil springI22, which spring is located on a similar'retaining stud I23'carried by a switch arm- :24. The switch arm I 24 is located on the shaft H6 adjacent the member ill, the arm I24 and member II'I being con nected for limited cooperative movement by a tongue and notch arrangement indicated by numeral E25 in Fig. 14. A spring member I26 connects the operating member I I? to a fixed portion of the device such as one of the arms I I 5 and serves to keep the follower I20 on the branch H0 inconstant engagement with the irregular surface H30, of the cam member H3 as well as to relieve the pressure on the micro-switch I 21 located on the arm I24. Thus, 'thedownward movement of the cam member H3, and rotation thereof when the handle M is operated to locate the lap and cutting tool with respect to one another for the start of the cycle of the surfacing operation, will position the follower I 29 on a low spot of the irregular cam surface lite of the cam H3. Then upon operation of the machine the cam II3 will rotate with the supporting plate 34. This will cause the cam follower I20 to be lowered as the high point of the cam surface iISa is approached, which in turn causes the branch i I0 and switch arm I24 to be lowered.

The normally closed micro-switch I2? which is secured'to the switch arm I24 is provided with a conventional switch operating plunger member We which, upon downward movement of the luv switch arm I24, is adapted to engage an adjustable contact member I29 located on an extension I30 formed on or secured to one of the arms I I5. The micro-switch I2? is suitably connected in an electrical circuit to the motor I32, which motor operates through conventional mechanism to rotate the drive disc 02 causing oscillation of the yoke 20 and also drives the adjustable stroke pawl mechanism 78; which simultaneously causes intermittent rotation of the supporting plate 34 about the axis of its pivot member 33, in a direction transversely to the oscillation of the yoke to feed the lap and tool relative to each other.

The are in which the lap or tool is rotated by the yoke, depending upon whether a convex or concave lap is being formed, controls the shape of curve formed in that meridian and the arcin which the lap or tool supporting plate 34 is moved by the intermittent action of thepawl mechanism 73 controls the shape of the surface formed in that meridian. Thus, when the entire surface of the lap has been shaped, the cam I13, which has been rotated simultaneously with the movement of the supporting plate 34, will cause a point on said high portion of the cam surface to be moved into engagement with the follower I20 causing said follower to be depressed and simultaneously will cause the switch I21 to be moved to a position wherein the plunger member I28 thereof will in turn cause the switch to be operated to open the circuit. Thiscauses the motor to become de-energized and will stop the operation of the machine. The function of the mechanism for controlling the operation of the machine so as to control the cycle of movement required to form a completely generated surface on the lap is as follows:- I

When the tailstock 43 is-in-itia'llyadjusted lon- "13 gitudinally of the supporting plate 34 to align the indicator on the plate 90 with the notch 9I, as shown in Fig. 11, according to the setting desired of the machine and to establish the curvature to be formed in the horizontal meridian of the lap, the member I carried by the tailstock base 44 and which is constantly in engagement with the control arm I02, will cause said control arm to be moved upwardly or downwardly depending upon the direction of said longitudinal movement. This movement of the control arm I02 will automatically cause the cam member I I3 to be raised or lowered a controlled amount to fix its position during the forming of the surface on the lap and this position will vary in accordance with the radius of curve to be generated in the horizontal meridian of the lap. This initial upward or downward movement of the cam.mem her I I3 simultaneously causes the cam follower I to be raised or lowered to a fixed initial position in proportion to the initial upward or downward movement of said cam and will therefore cause the subsequent rotation of the cam II3 during the operation of the machine to move the high point thereof in a direction toward the cam follower I20 whereupon said high point will depress the follower and cause the plunger member to trip the switch to open position whereupon the motor will be de-energized and stop the operation of the machine. stock 43.is adjusted longitudinally of the supporting plate 34 to a fixed position for the generation of a curve of a relatively short radius, the member I 05. carried by the tailstock will move to a position on the control arm I02 which allows said control arm to move upwardly and thereby cause the lever I04 to raise and permit the cam II3 to be simultaneously lifted to an initial fixed position according to the radius of curve to be generated, it being understood, of course, that the above described setting is controlled by the use of gauge means such as set forth above. The shaft 36 is then manually rotated by means of the hand grip member II to move the lap and tool to initial adjacent relation to each other for starting the operation of the machine. This rotation of the shaft and, in turn, the rotation of the supporting plate 34, will impart a rotary movement to the cam I I3 and will move said cam into proper starting relation with the follower I20, that is, it will position the high point on the cam surface 312 at a proper distance from the cam follower I20 to insure the full cycle of movement of the tailstock 43 required to complete the surface prior to having the high point on the cam engage the cam follower I20 to trip the switch to de-energize the motor.

When the tailstock 43 is adjusted to a fixed position to generate a curve of a relatively long radius the member I05 in engagement with the .control arm I02 will move to a position on said arm causing said arm to be depressed in proportion to said movement and in turn move the cam II 3 in a downward direction and to a fixed position determined by the arc of the curve to be generated. The function of the device in producing this curve is similar to that described above and by reason of the fact that the cam is initially moved downwardly to accommodate a curve of a longer radiu this downward movement will initially depress the plunger I 28 of the switch an amount whereby only a relatively small rotary movement of the cam member I I3 will be required to move the high point thereof into engagement with the follower I20 whereupon further depress- Therefore, when the tailing of the plunger I28 will take place. This causes the switch to be tripped to open the circuit and deenergize the motor at the proper time required for stopping the machine at the completion of the forming of the surface of long radius. With this arrangement the time interval of the operation of the machine is only that required to complete the surface of any desired curvature.

Since it might be desirable, however, to manually rotate the supporting plate 34 beyondthe point at which the machine is rendered inoperable, there is provided a stop I3I adjustably'located in the extension I30 adjacent the contact I29. The stop I3I is positioned to be enga'gedby the microswitch I2! with the coil spring I22 absorbing the strain imposed upon the device by the cam follower I20 when the follower is forced to follow the irregular surface of the cam II3 to a point even higher than that necessary to operate the switch I21, this'excessive movement also being permitted by the connection I25, thus preventing damage of the parts of the device.

From the foregoing description it will be seen that simple, efficient and economical means have been provided for accomplishing all of the objects and advantages of the invention. By providing the improved features described, it can be seen that the present invention is a considerable improvement over prior machines used for generat ing curved surfaces on articles such as lapsby providing a machine of extremelycompact nature which will produce curves ranging from 2 'to' 20 diopters which formerly required the use of large, bulky space-taking machines. Also are provided means for more accurately and quickly setting up a machine of this typev and means for automatically stopping the operation of the machine after completion of a surfacing operation regardless of the radius of curvature being generated. Such a machine, as disclosed herein may be easily adjusted, maintained and repaired.

While certain novel features of the invention have been shown and described and are pointed out in the annexed claims, it will be understood that various omissions, substitutions and changes in the formation and details of the deviceillustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention.

We claim: v

l. A machine for generating a spherical or compound curved surface on an article comprising the combination of a base having a pair of spaced uprights thereon, a first supporting member pivotally connected with said uprights, pivot means connecting said first supporting member with said uprights, said first supporting member being mounted for oscillating movement about the axis of the pivot means, a second supporting member adjustably mounted on said base for movement in a direction toward and away from said uprights, a pivot member connected for movement with said second supporting member and having its axis substantially perpendicular to the axis of said pivot means, said second supporting member being mounted for movement about the axis of the pivot member, retaining devices on said supporting members, one of said retaining devices supporting a cutting tool and the other of said devices supporting work to be engaged by said cutting tool, power means for imparting an oscillating movement to the first supporting member and its associated retaining device about the axis of said pivot means and 13 for impartinga rotative movement to the said supporting member and its associated retaining device ab'out the axis of said pivot member, a

circuit connecting said power means with a source of electrical energy, circuit control means in said circuit, and means for automatically rendering said power means effective only hroughout the angle of movement of one of said retaining devices relative to the other of said retaining 6.5- vices necessary to complete a surface of required curvature on the work, said means'comprising a spindle rotatable with said pivot member and adjustable longitudinally thereof in response to the adjustment of said second supporting member toward or away from said uprights and a cam member on and rotatable with said spindle, said circuit controlling means being operativcly associated with said cam member in such manner as to energize and'de-energize the power means at'controlled positions of movement of one or" said retaining devices relative to the other.

2'. A machine for generating a spherical or compound curved surface on an article comprising the combination of a base having a pair of spaced supports thereon, a supporting member pivotally connected with said supports, pivot means connecting said supporting member with said supports, the supporting member being mounted for oscillating movement about the axis of the pivotmeans, a, second supllqrting member adiu'sta' lr n e o said a e fo m ent 'a direction toward and away from said sup ports, a pivot member connected for movement with said second supporting member and having its axis substantially perpendicular to theaxis of said'pivot means, said second supporting men b'er being mounted for movement. about theaxis of the pivot member, an upright carried by and longitudinally adjustable of said second supportin'g member, retaining devices on said first supporting member and said upright, one of said retaining devices supporting a cutting tool and the other or said devices supporting work to been-r gasecl by'said cutting tool, power means for imparting an oscillating movement to the first supporting member and its associatedretaining device about the axis of said pivot means and for imparting a rotative movement to the second supporting member and its associated retaining device about the axis of said pivot member, a circuit connecting said power means with a source of electrical energy, a control arm carried by said secondsupporting member and operated by said upright upon adjustment of said upright on said second supporting member, a spindle rotatable with said pivot member and in operative engagem'en't'with said control arm for adjustment longi-- ture on the work.

7 3. In a machine for generating a spherical or compound curved surface on an article, the combination of a base having a pair of spaced uprights thereon, an article supporting member mounted onrsaid base, a substantially U-shaped yoke pivotally connected with said uprights, the base portion of said u -shaped yoke carrying an articleto. be positioned withgrespectto the artiasserts ole carried by said supporting member, pivotmeans connecting said yoke to said uprights" for oscillating movement about the axis of the pivot means, said pivot means comprising bearings located adjacent the ends of said yoke and ro tatably disposed within said uprights, one of said bearings having a connection member disposed for movement therewith, power means for causing'oscillation of said yoke, and including '1 an operating arm mounted for oscillating movee merit co'ax iall'y with said yoke and having dia metrically opposed extensions termed thereon, connection means for connecting said connec tion member'to one of saidextensions, saidcon nection means being of a detachable nature so as to permit disengagement of said connection member from the extension, rotation of said yoke independently of said operating arn'i' to cause the base portion of the yoke to extend toward or away from said supporting member depending upon the initial position thereof, and attachmentof the connection member to the opposed extension, whereby the article carried by the yoke will be positioned toward or awayfroin said supporting member in. accordance with the position of the yoke.

4. In a machine for generating a sphericalor compound curved surface on an article, the combination of a base having a pair ofspaced uprights thereon, a first article supportingimember mounted on said base, a second supporting member pivotally connected with said uprights and having its article retaining portion extende me away from said first supporting member'and carrydng an article positioned for engagement with the article carried by said first suppfl ting member, pivot means connecting said second supporting member to said uprights for oscillating movement about the axis of the pivot means and consequent coaxial movement of the article carried by said second supporting mem: her about a radius determined by the distance between said article and the axis of the pivot means, said pivot means comprising bearings located adjacent the ends of said second sup! porting member and rotatably disposed within sa d uprights; one of said" bearings having a connection member disposed, for movement therewith, power means for causing oscillation of said second supporting member and including an operating arm mounted for oscillating-move; ment coaxially with said second supporting member and ha n diametrically opposed exe' tensions'formed thereon, connection means for connecting said connection member, to one of said extensions, said connection means being of a detachable nature so as to permit disengage-e:

, ,ment of said connection member from the extension, rotation of said second supporting member independently of said operating arm tOPOSi-ft1on its article retaining portion toward said first supporting member and permit the 1 article, car-5 r1ed thereby to be oscillated about a radius" longer than that allowable by the initial post-. tion of. the second supporting member and at.- t'a'chinent of the connection'member to the 013*, posed extension. 7

5 In a machine for generating a spherical or compound curved surface on an article, a basehaving a pair of spaced uprights thereon, asu p port pivotally mounted upon said base for osci1: lating movement about theaXis of its pivot, a sup Ql mg member adjustably mounted on saidbase for pivotal movement about an axis sub; stantiailyperpendicuiar to the axi of saidisup, port and having indicating plates adjustably carried thereby, a slideway formed on, said base a ca yi said supporting member for movement towardand away from said support, retaining devices on'said support and sa d supportin m mber, one of said retaining devices .supporting'the' article ,to be surfaced and the other'of said devices supporting an article used forforming the surface on the article to be surfaced, said articles having portions thereof adapted for operative engagement with each other, locating means carried by the base adjacent said-slideway, locating means carried by the supDQrt adjacent its retaining device,

cating means carried by the supporting member adjacent its retaining device, gauge means comprising an elongated bar memberhaving an engagement end portion shaped for e ag me t with the locating means carried by said support and said supporting member, said bar member having raduations thereon anda slide mounted for longitudinal movement therealong for alignment with said graduations, said slide having an alignment portion adapted to be aligned with the article carried by theretaining device in said'support when said end portion is in engagement with the, locating means of said support whereby the distance between the axis of the support and the articlefcarried by the support may beze's'tablished, said slide member further being adapted for alignment with one of the indicatingplateson said supporting member when said endportion isin engagement with the loeating means' "carried by the supporting member whereby the distance between 'theengaging, portions' of the articles and the axis or thefsupporting member may be established, said-slide further havin anengagement portion adapted tobeengaged withthe locating means carried by'the base,fand a secondjslide carried by said bar member, the other of said indicating plates on the supporting member being adapted to be brought into alignment with said second slide so as to further determine the spacing of the engagingportions of the articles from the axes of the support and supporting member.

6, 'In amachine for generating a spherical or compound curved surface on an article, a base having a pair of spaced uprights thereon, a support pivotally mounted upon said base for oscillating'movement about the axis of its pivot, a supporting member adjustablymountedon said base for pivotal movementabout an axis substantially perpendicular to the axis of said support and having indicating plates adjustably carriedthereby,a slideway formed on said base and carrying said supporting member for movement toward and away from said support, retaining devices on said support and said supporting member, one'of said retaining devices supporting the article to be surfaced and the other of said devices supporting an'article used for forming the surface on the article to be surfaced, said articles having portions thereof adapted for operative engagement with each other, locating means carried by the base adjacent said slideway and comprising a shelf having a pin member located near one end thereof, locating means in the nature of an opening in the support adjacent its retaining device, locatingmeans comprising a bosshaving an opening formed therein, the boss being carried by the supporting member adjacent its retaining device, gauge means comprising an elongated bar member having an engagement end portion shaped for engagement with the openings in the locating means carried by said support and said supporting member, said bar member having graduations thereon and a slide mounted for longitudinal movement therealong for alignment with-said graduations, said slide having an alignment portion adapted to be aligned with the article carried by the retaining device in said support when said end portion is in engagement with the opening in the locating means of said support whereby the distance between th axis .of the support and the article carried by the support may be established, said slide member fur,- ther being adapted for alignment with one of the indicating plates on said supporting member when said end portion is in engagement with the opening in the locating means carried. by;the supporting member whereby the distance between the engaging portions of the articles and the axis of the supporting member may be established, said slide further havingan opening adapted to be engaged by the pin member of the locating means carried bythe base when the gauge means is positioned on the shelf thereof, and a second slide carried by said bar member, the other-of said indicating plates on the supporting member being adaptedto be brought into alignment with said second slide so as to further determine the spacing of the engaging portions of the articles from the axes of the support and supporting member.

the article to be surfaced, a cylinder member mounted for rotation within'said headportion and having the cutting tool fixedly secured therein, said cutting tool having its cutting point aligned with the longitudinal axis of'the clapper box, stop means for preventing rotation of said cylinder when pressure is exerted upon, the cutting tool from one direction, and resilient means for maintaining the cylinder in located position with respect to the stop means for yieldably permitting rotation of the cylinder when pressure is exerted upon the cutting tool from the opposit direction.

8. In a machine for generating a spherical or compound curved surface on an article, a base having a first support mounted thereon for carry ing the-article to be surfaced, and a second support pivotally mounted upon said base for osci1-'- lating movement about the axis of its pivot, said second support supporting means for yieldably carrying a cutting tool in operative engagement with the article, said means comprising a clapper box having a shank portion supported in the retaining device and a head portion disposed in a direction toward the article to be surfaced, a cylinder member mounted for rotation within said head portion and having the cutting tool fixedly secured therein, said cutting tool having its cutting point aligned with the longitudinal axis of the clapper box, stop means comprising a pin member fixedly located in said head portion and adapted to be engaged by a notch formed in said cylinder for preventing rotation of the cylinder when pressure is exerted upon the cutting toolfrom one direction, and resilient means "for-maiiitaining the cylinder in located position respect to the stop mahs' and for yieldably permitting 'l fotatioi of the cylinder when pressure is exerted upon the cutting tee rrem the opposite a 9. In a m'eehine for geneieunee spherical or epmpeuhd eurvedsurreee on an: eruel'ege base aving a; first su port mounted thereon forsu'p partin thearticle to' be surr eeu', and e second support pivotally' haunt d up n said eseroi; oseiueun' movement about the axis r its pivot, said ieeueut ward the articleto be surfaced; a cylindelf mem er mounted for rotation within said head peguen and havingthe cutting tool fixedly" secured threim'said surfing tool havingits cutting lib'iht aligned with th longitudinal axis of the clappe boil, stop means comprising a pin member fixedly located in said head portion and adapted to be "engaged by a notch formed in said oylifider for rev nting rotation of the c nderwhehpressur j is exerted upon the cutting reel from one direction, and resilient means com: prising a resilient spring member disposed within said shank portion under compression and a pin arrangement'urged by said resilient spring membr toward a secohd riotch formed in said cylinder or maintainihgthe cylinder in located position with respect to the tep means and for yieldably permitting rotation of the cylinder hen pressure is 'ex'erted upon the cutting tool from the opposite direction: f

10 A surface generating device of the character described comprising the combiiiationof a base, a first Supporting member mounted on said base for eseinauhgmevement about a givehexis, a second 'supportiiig member mounted for swinging m nient about an axis substantially 1EK-ZfD erI- dicular to the axis cream first su orting means, sneer said supporting members being adapted for support ng a; cutting 1:001 and the other being adapted f!" supportifigwork to be engaged by said eu'tting tool, adjusting means for moving the second s pporting member toward and away from the axis about which said first supporting membar is mounted for oscillating movement, and drive means acting on said second supporting member for imparting swinging movement thereto about its axis, means for energizing and de-.

energizing the action'o'f said drive means, and control means swinging with the Second supporting' member and adjustabl in res qnse to the position to which said second su porting mem er is adjusted felative to the aXis about which said supporting member ciscillates, said energizirig and de e'nerg'izing means being operably associated with the control means in such manner as to energize and de-en'ergize the action of the drive means at controlled positions of movement of one of said supporting members relative to the other, whereby said drive means will be e'fiectiv "only throughout the angle of movement of one of said supporting members relative to the other necessary to complete a surface of required curi ature oh the work.

11. A surface generating device of the character described comprising the combination of a base; a first supporting member mounted on said base for oscillating movement about a given axis,

a second supporting member mounted for swing-- ing movement about an axis substantially per pend icular to the axis ofsaid first upper-ting means; one of said supporting members'hafig holding means for' supporting a cutting too the other aving holding meens for supp Wiofli to be engaged by said cutting tool, adjusting means for moving the holding means on a respective supportingmember toward and away from the axis about which said member is mounted for movement in accordancewith the curve desired to be generated by the tool on the work, and drive means for imparting oscillating mavem ht to the first supporting member ab'out its axis and for imparting swinging" movement the second supporting member about its'aiiis, control means for nrgizingand ae-eh rgizmg the action of said drive means, and cooperative means carried by the second supporting member and its respective holding means operable on said control means in response to the position to which said holding means is adjusted on said second supporting member to energize and deeenerg'i'zje the action of the drive means at controlled pos'i' tions of movement of one of said supportingj'memb'er's relative to the other, whereby said drive means will be effective only throughout the angle of movement of one of said supporting members relative to the other necessary to complete a stirface of required curvature on the work, 7

12. A surface generating device of the char acter' deSCribed'comprising a pair of supports, being adapted to support a work member ha a surface to be generated and the other being" adapted to support a tool member, one of said supports being mounted for oscillating movement about agiven axis and the other being moun ed on a table rotatably mounted for movement about an axis disposed approximately normal to the axis about which the first support eseiuetes, said seconds'upport' being mounted on said table for; adjustment toward and e ey from' the aiiis of said table tfl vary the resins about wmeh the member carried thereby is' swingab'le by rotation of the table in-accordance with the entr es to be plfbduced on the work, means for' rotating the, table to position the mem er carried bythe second support to one side of the member carried by the first supportwhere, by subsequent oscilla tion of the first support and rotation of the'table, the tool may be caused 'to generat a surface on thework, and drive means for rotating the table and oscillating the first support to obtain said generating action, means for aeeeherg zmg the action of said drive means, control means carried by the table and operable on said tie-energizingmeans uponrotatio'n of the table a controllable amount, said control means being adjustable to varythe amount of rotation of the table required before it will operate the die-energizing means; and said adjustment of the control means being responsive to the adjustment of the second support on the rotatable table relative to the axis thereof whereby the action of the drive means to rotate the table may be automatically controlled so as to be efiective only sufii'cient to gei1- erate the surface on the work.

13. A surface generating device of the character described comprising a pair of supports, oh, being adaptedto suppert a wor member having a surface to be generated and the other eifig adapted to support e tool member, ehe er said supports being mounted on a base for oscillating movement spent a giveh axis and the other being mounted on a table rotatably mounted on said base for movement about ah axis disposed ap:

firstsupport oscillates, each of said supports being table toward and away from therespective n jut, which it is moveable to vary thejradius about men the respective member carried thereby is swingable in accordance with the'curved surface desired to be produced on thework, meansfor rotating the table to position the member carriedby the second support member to one side'Toffthe member carried by the first support where; by'subsequent oscillation of the first support and rotation of the table, the tool may be caused to generate a surface on the work, and drive means for rotating the table and oscillating thej'first support to obtain said surface generat ingl'action, means for de-energizing the action of said drive means, control means carried by the table jand operable on said de-energiz'in'g means upon rotation of the table a controllable'amount, said control means being adjustable to vary the amount of rotation of the table required before it will operate the de-energizing means, and said adjustment of the control means being responsive to the adjustment of the second support on the rotatable table relative to the axis thereof whereby the action of the drive means to rotate the table may be automatically controlled so as to be effective only sufiicient to generate the desired curve on the work.

-14. A surface generating device of the character described comprising a base, a pair of supports, one being adapted to support a work member having a surface to be generated and the other being adapted to support a tool member, one of said supports being mounted on said base for oscillating movement about a given axis, a slide member adjustably mounted on the base for .movement in directions toward and away from said axis about which the first support is mounted for oscillating movement, a table rotatably mounted on said slide member for movement about an axis disposed approximately normal to theaxis about which the first support oscillates, said second support being mounted on said table for-"adjustment toward and away from the axis of'said table and said first support having means for'adjusting the separation of the member carried thereby relative to the axis about which it oscillates to permit the radiusabout which the respective member carried thereby is swingable in accordance with the curvatureof surface desired to be produced on the world-means for rotating the table to position the member carried by the second support member to" one sideof the member carried by the first support, adjustment means for bringing said members into relative positions where, by rotation of the table, the member carried by the second support may be moved transversely of the member carried by the first support to generate the desired, surface, and drive means for rotating theltable and oscillating the first support to obtain said generating action, means for tie-energizing the action of said drive means, control means carriedib'y the table and operable on said de-energizingmeans upon rotation of the table a controllable amount in a direction to move the member carried by the second support from said starting position to one side of the member carried by the firstsupport in a direction transversely thereof, said control means being adjustable to vary the amount of rotation of the table required before it will operate the de-energizing means, and said adjustment of the control means being responsive to the adjustment of the second support on the rotatable table relative to the axis about which the table is rotatable whereby the action of the drive means to rotate the table may be automatically controlled to be effective only sufficient to generate the desired surface on the work.

WILLIAM A. GUNNING. GEORGE C. FAVRE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

